Nearly 10,000 people have taken to the streets in major cities across Greece to protest against the government's plan to tackle its economic problems.
In the capital, Athens, the May Day rally on Saturday was marred by violence as groups of angry rioters clashed with police. At least one officer was set on fire when protesters hurled Molotov cocktails at security forces.
The protesters were demonstrating against a government plan to impose tough spending cuts, as it seeks a financial rescue package from the European Union and the International Monetary Fund (IMF).
Al Jazeera's Barnaby Phillips reports from Athens.